German Chancellor Olaf Scholz warned Iran not scupper negotiations to save the 2015 nuclear agreement on Saturday, calling on Tehran to make concessions. “The Iranian leadership now has a choice: now is the moment of truth,” Scholz told the Munich Security Conference. “We have come a long way in the negotiations in Vienna in the last 10 months. All the elements for a conclusion of the negotiations are on the table,” Scholz said. However, he said, it would be unacceptable if Iran continued its enrichment of uranium while simultaneously suspending monitoring by the International Atomic Energy Ag…